Reid said on Feb. 26 in a debate on the Senate floor about Obamacare that the ads by the Koch brothers'-backed group, Americans for Prosperity, against Democrats, tying them to the problematic new healthcare law, "are untrue, but they're being told all over America."

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He then went on to accuse the Koch brothers of "trying to buy America" by telling lies about Obamacare.

"I can't say that every one of the Koch brothers' ads are a lie," Reid said, adding that "a vast majority of them are."

"What is going on with these two brothers who made billions of dollars last year in an attempt to buy our democracy is dishonest, deceptive, false, and unfair," he continued. "Just because you have huge amounts of money, you should not be able to run these false, misleading ads by the hundreds of millions of dollars."

Since October, the conservative group has spent $25 million attacking Obamacare and Democrats who support the law.

Doocy said Wednesday on "Fox and Friends" that Reid had a history of making disparaging remarks about his political opponents from the Senate floor, Politico reported.

"For instance, 'un-American.' I mean, that's over the line," Doocy said. "But then remember he said those crazy things about 'I know somebody who says Mitt Romney didn't pay taxes in 10 years.' Then he suggested that Mitt Romney was a felon.

"Why does he say it on the Senate floor?" the Fox News host asked. "Because there he has got immunity. If he were a real man, and he really felt like that, say it off the floor where you don't have immunity."